<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<book xmlns:xi="http://www.w3.org/2001/XInclude" id="test" lang="en">
  <title>Test 'boostbook' root.</title>
</book>